Valve-gear.



No. 799,169. PATQENTBD SEPT. 12, 1909. G. W. KING, H. J. BARNHART 9 0. B. KING.

VALVE GEAR.

APPLICATION FILED JULY 25,1904.

2 SHEETSSHBBT 1 witnesses No. 799,169. PATENTED SEPT. 12, 1905. G. W. KING, H. J. BARNHART & G. B. KING. VALVE GEAR.

APPLIOATION FILED JULY 25,1904.

2 SHEETS-SHEET 2.

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UNITED STATES PATENT OFFICE.

GEORGE WV. KING, HARRY J. BARNHART, ANI) CHARLES B. KING, OF

MARION, OHIO, ASSIGNORS TO THE MARION STEAM SHOVEL COM- PANY, OF MARION, OHIO, A CORPORATION OF OHIO.

VALVE-GEAR.

Specification of Letters Patent.

Patented Sept. 12, 1905.

Application filed July 25, 1904. Serial No. 217,955.

To all zulw'nt it IN/(by concern:

Be it known that we, GEORGE IV. KING, IIARRY J. BARNHARI, and CHARLES E. KING, citizens of the United States, residing at Marion,in the county of Marion and State of Ohio, have in vented certain new and useful Im provements in Valve-Gear, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to valve-gear, and more particularly to certain features of construction relating to the connections between the link and its lifting or shifting mechanism, on the one hand, and between the link and the stem of the valve which it controls, on the other hand.

The primary object of the invention is to provide a construction whereby the objectionable slipping of the link-block, which is a frequent source of trouble in all engines using link reversing-gears, may be almost entirely overcome, particularly when the parts are in position to cause the engine to run in the direction in which it is most used, which may be termed the forward motion, while at the same time a straight link is employed having rectilinear guideways, which link may be readily and cheaply constructed.

Further objects of the invention are to provide a simple and effective connection between the link-block and the valve-stem and its guide-block, to provide an effective and readily-adjusted means for taking up any looseness in said connections, and thereby preventing lost motion, to make provision such that the parts will adjust themselves in case the guide-block wears out of line, to provide an eflicient means for guiding the guide-block and so connecting and proportioning the parts as to provide against excessive wear, and certain other provisions, which will be hereinafter more specifically referred to.

To these ends our invention consists in certain novel features, which we will now proceed to describe and will then particularly point out in the claims.

In the accompanying drawings, Figure 1 is a side elevation, partly broken away, of a structure embodying our invention in one form, the link being disconnected from the eccentric-rods and the guide-block being removed from its guideway. Fig. 2 is an end elevation of the same parts, the bell-crank being omitted and the guideway and valve-stem being shown in section. Fig. 3 isaplan view of what is shown in Fig. 1 with the bell-crank omitted, and Fig. 4: is a central vertical sectional view with the link moved into a position at right angles to the guide-block.

Referring to said drawings, 1 indicates the link as a whole. In the ease of the particular structure which we have selected for the purpose of illustrating our present invention the purpose or function of the link is that of a reversing device only, said structure not being organized to effect hooking up or the variation of the point of cut-off of the slidevalve. For this reason the link shown is a straight link, which form is more readily and cheaply constructed in an accurate manner than the curved form of link employed when it is desired to control the cut-off. The link may be of any preferred construction, that shown being one in which the link is composed of two parallel guide-bars 2 and 3, the latter provided with apertured lugs i to receive the eccentric-rods, and spacing-blocks 5, interposed between said bars at their ends, the bars and blocks being connected by throughbolts 6.

7 indicates the link lifter or hanger, which in the present instance is connected at its upper end to the link and at its lower end to the lifting mechanism, said lifting mechanism being located below the link in the particular form of construction chosen for the purpose of illustrating our invention. It will be understood, however, that our invention is also applicable to a structure in which the lifting mechanism is located above the link. In the present instance the lifter 7 is shown as pivoted at 8 to an arm 9 of a bell-crank lever 10, the other arm 11 of which has connected to it the operating-rod by which said bell-crank lever is actuated. The lifter, it will be noted, is connected to the link at or near that end thereof farthest from the operating mechan ism, and this feature of our invention is of material importance, for the reason that by so connecting the lifter to the link these parts have the same motion, or substantially so, by reason of which fact the slipping of the linkblock is practically overcome. This is particularly the case when the parts are in the position shown in the accompanying draw: ings, whlch position may be adopted for the running of the engine in forward motion or in the direction in which it will be most used. The pivotal connection between the lifter and link may be eflected in any approved manner; but We prefer for this purpose the construction which we have devised and which is shown in the accompanying drawings. In this connection 12 indicates a journal-pin which is secured in the hub or collar 13 at the upper end of the lifter by means of a tapering securingpin 14, which passes through said hub or collar and through the journal-pin, which have correspondingly-tapering apertures to receive said securing-pin. Said securing-pin is firmly held in position by reason of its taper, but may be readily removed and replaced when worn. The journal-pin 12 passes through and has a bearing in a suitable aperture 15 in the upper spacing-block 5 of the link and is held in position by the hub or collar 13 at one end and by a cap-screw 16 at the other end threaded into an axial aperture 17 in the end of the pin 12, a washer 18 being interposed between the head of the cap-screw and the end of the pin 12 and being of a greater diameter than said pin, so as to bear against the adjacent face of the block 5. By reason of this construction the lifter and the link are readily connected and disconnected and are effectually held in proper relation to each other when in operation.

19 indicates the link-bloclnwhich' slides between the guide-bars 12 and which is connected to the valve-stem 20 by means of a pin 21, on which it is pivotally mounted.

22 indicates, a guide-block having an opening 23 extending through it longitudinally, and the valve-stem extends into said opening and is provided about midway of the length of said guide-block with an eye 24 of less width than the opening 23. The pin 21 extends transversely through the guide-block to which it is secured and through the eye 24 of the valve-stem 20. The guide-block is provided with a lateral boss or sleeve-like extension 25, surrounding the pin 21 and provided with a set-screw 26, which secures the pin 21 tothe guide-block. The outer end of this boss or sleeve 25 forms an abutment against which one face of the link-block 19 bears, and said link-block is held in position on the pin 21 against the boss 25 by means of acap-screw 27 axially threaded into the end of the pin 21 and having interposed between its head and the end of the pin a washer 28 of greater diameter than the pin, so as to bear against the other face of the link-block 19. Thevalvestem- 20 is provided with an extension 29 beyond the eye 24, which extension passes out beyond the end of the guide-block 22 and is threaded to receive on its projecting end a nut 30, between which and the end of the guide-block there is interposed a washer 31, which bears upon the end of the guide-block. By tightening up the nut 30 the eye 24 of the erably faced on its three closed sidesto wit,

at top and bottom and on its inner vertical face-with a facing 33 of Babbitt metal or other antifriction material. The fourth side of the guideway is open, but is provided with a cover-plate 34:, secured to the guide 32, by screw-bolts 35. This cover-plate is provided with a slot or elongated opening 36 for the passage of the boss or sleeve 25, which permits the link and link-block to be supported centrally with respect to the guide-block, thereby equalizing the strain and Wear on said block. The guide-block is made large enough to provide ample wearing-surfaces, and the cover-plate 3 1 bears against the outer face of said block, suflicient space being left between said plate and the adjacent face of the guide 32 to permit said plate to be adjusted by means of the bolts 35 to take up any wear which may occur between the guide-block, guide, and plate. The plate is preferably made of cast material, so as to provide a good bearingsurface, thus dispensing with an antifriction lining on this side of the guide-block and doing away with the increased thickness which such a lining would occasion.

It will be seen that the connections between the link-block,valve-stem,and guid e-block are simple and effective, that the valve-stem can readily adjust itself to any variations in the alinernent of the travel of the guide-block, and that ample and effective provision is made for taking up wear between these parts and also between the guide-block and guide.

We do not wish to be understood as limiting ourselves strictly to the precise details of construction hereinbefore described, and shown in the accompanying drawings, as it is obvious that various modifications may be made therein without departing from the principle of our invention.

Having thus described our invention, what we claim as new, and desire to secure byLetters Patent, is-

1. In a link-motion, a guide-block, in combination with a valve stem having an eye within the guide-block, a journal-pin mounted in the guide-block and passing through the eye of the valve-stem, and a link-block mounted onsaid pin, substantially as described.

2. In a link-motion, a guide-block having a recess therein, in'combination with a valvestem having within said recess an eye of less width than the recess, a journal-pin mounted IIO in the guide-block and passing through the eye of the valve-stem, and a link-block mounted on said pin, substantially as described.

3. In a link-motion, a guide-block having a longitudinal opening therethrough, in combination with a valve-stem having an eye within the guide-block, said stem being extended beyond said eye and provided on its extremity with a take-up device bearing against the end of the guide-block, a journal-pin mounted in the guide-block and passing through the eye of the valve-stem, and a link-block mounted on said pin, substantially as described.

4. In a link-motion, aguide-block having a longitudinal opening therethrough, and a transverse pin to receive the link-block, in combination with a valve-stem having within the guide-block an eye through which said pin passes, said stem extending beyond the eye and having a threaded extremity projecting beyond the end of the guide-block, a nut mounted on said threaded extremity, and a washer interposed between said end and the end of the guide-block, substantially as described.

5. In a link-motion, a guide-block having a longitudinal opening therethrough and a lateral boss or sleeve projection provided with a set-screw.ajournal-pin extendingtransversely through the block, acrossthe opening thereof and through and beyond the boss or sleeve projection, in which it is secured by said setscrew, a link-block journaled on the projecting end of said pin, a valve-stem extending entirely through the longitudinal opening of the guide-block and having therein an eye through which the journal-pin passes, the projecting end of said valve-stem farthest from the valve being threaded, a nut mounted on said threaded end, and a washer interposed between said nut and the end of the guideblock, substantially as described.

6. In a link-motion, a guide provided with a guideway open at one side, a valve-stem guide-block mounted in said way and provided with a central laterally-projecting journalpin, a link having a link-block mounted on said journal-pin, and a cover-plate mounted on the open side of the guide and provided with a longitudinal slot for the passage of the journalpin, said cover-plate bearing against the outer face of the guide-block, free from contact with the face of the guide, and being provided With screw-bolts connecting it to the guide, whereby wear may be taken up, substantially as described.

In testimony whereof we atlix our signatures in presence of two witnesses.

GEORGE IV. KING. HARRY J. BARNHART. CHARLES B. KING. WVitnesses:

Roemrr G. Lucas, WVILLIAM R. SiusLEa. 

